APA (7th ed.) Citation

Williamson, A. M., Williamson, C. N., & Hatherell, W. (2006). Rosemary: A Christmas story. Project Gutenberg.

Chicago Style (17th ed.) Citation

Williamson, A. M., C. N. Williamson, and William Hatherell. Rosemary: A Christmas Story. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Williamson, A. M., et al. Rosemary: A Christmas Story. Project Gutenberg, 2006.

Warning: These citations may not always be 100% accurate.